Citizen Promaster Sky Super Skyhawk JY0080-62E Instruction Manual page 68

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Ratios
Question 30 / 20 = 60 / x
Align "30" on the
scale to inner "20".
The answer "40" (40)
corresponds to "60" on
the scale. In addition,
Answer
the ratio of the value on
the scale to the inner
value is 30:20 at all
positions on the scales.
66

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